The Rules of Attraction by Bret Easton Ellis

Lauren changes boyfriends every time she changes majors and still pines for Victor, who split for Europe months ago, and she might or might not be writing anonymous love letters to ambivalent, hard-drinking Sean, a hopeless romantic who only has eyes for Lauren — even if he ends up in bed with half the campus — and Paul, Lauren's ex, forthrightly bisexual and whose passion masks a shrewd pragmatism. They waste time getting wasted, race from Thirsty Thursday Happy Hours to Dressed to Get Screwed parties to drinks at The Edge of the World or The Graveyard. The Rules of Attraction is a poignant, hilarious take on the death of romance.